<?php

/**
 * Field handler to provide simple renderer that allows linking to a file.
 */
class views_handler_field_file extends views_handler_field {

    /**
     * Constructor to provide additional field to add.
     */
    function init(&$view, &$options) {
        parent::init($view, $options);
        if (!empty($options['link_to_file'])) {
            $this->additional_fields['filepath'] = 'filepath';
        }
    }

    function option_definition() {
        $options = parent::option_definition();
        $options['link_to_file'] = array('default' => FALSE);
        return $options;
    }

    /**
     * Provide link to file option
     */
    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $form['link_to_file'] = array(
            '#title' => t('Link this field to download the file'),
            '#description' => t('This will override any other link you have set.'),
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['link_to_file']),
        );
    }

    /**
     * Render whatever the data is as a link to the file.
     *
     * Data should be made XSS safe prior to calling this function.
     */
    function render_link($data, $values) {
        if (!empty($this->options['link_to_file']) && $data !== NULL && $data !== '') {
            $this->options['alter']['make_link'] = TRUE;
            $this->options['alter']['path'] = file_create_url($values->{$this->aliases['filepath']});
        }

        return $data;
    }

    function render($values) {
        return $this->render_link(check_plain($values->{$this->field_alias}), $values);
    }

}
